overlay.d: s390x: add to ramdisk missig zipl

This is a fix for https://bugzilla.redhat.com/show_bug.cgi?id=1955621
When starting OCP in fips mode it immediate fails during install:
```
systemd[1]: Starting Check for FIPS mode...
rhcos-fips[763]: Found /etc/ignition-machine-config-encapsulated.json in Ignition config
rhcos-fips[763]: FIPS mode required; updating BLS entries
rhcos-fips[763]: Appending 'fips=1 boot=LABEL=boot' to /run/rhcos-fips/sysroot/boot/loader/entries/ostree-1-rhcos.conf
rhcos-fips[763]: /usr/sbin/rhcos-fips: line 78: zipl: command not found
```

Signed-off-by: Nikita Dubrovskii <nikita@linux.ibm.com>

overlay.d/05rhcos/usr/lib/dracut/modules.d/40rhcos-fips/module-setup.sh

@@ -17,6 +17,12 @@ install() {
         bwrap \
         env
 
+    local _arch=${DRACUT_ARCH:-$(uname -m)}
+    if [[ "$_arch" == "s390x" ]]; then
+        inst_multiple zipl
+        inst /lib/s390-tools/stage3.bin
+    fi
+
     inst_script "$moddir/rhcos-fips.sh" \
         "/usr/sbin/rhcos-fips"
     inst_script "$moddir/coreos-dummy-ignition-files-run.sh" \